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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
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How should values be selected for the constants for the snubber circuit connected to the triac?

This is a circuit diagram symbol for a variable-capacitance diode.

Variable-capacitance diodes are abbreviated as VCDs. They are also called varicap diodes.
Variable-capacitance diodes has a variable capacitance which is a function of the voltage between anode and cathode.
General-purpose diodes are used for rectification and signal detection, and variable-capacitance diodes are used for RF impedance matching in automatic tuners and transmitters.

snubber circuit

A snubber circuit is inserted for suppressing a suddenly rising voltage (dV/dt) to prevent malfunction. Toshiba recommends RS=47Ω and CS=0.033μF for a 100VAC system, and RS=100Ω and CS=0.1μF for a 200VAC system.
Refer to Toshiba Application Note "Triac couplers-basic properties and application design", section 9.6.